"Chat realms"

Imagine two JJ2 servers. A program joins both servers and captures the chat feed. The chat from server A is sent to server B and the other way around. Now the people in server A can chat with the people in server B.

Extrapolate this: the chat from an indefinite number of servers can be linked together.

It gets interesting when an "exit" links the levels of two servers together. That is, a place in the level of server A where the player will automatically leave the server and join server B (at the other end of the same exit).

Combine these two systems, and you get an interconnected realm where multiple levels/servers make up one world.